ios Application Development Lecture 5: Protocols, Extensions,TabBar an Scroll Views
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1 ios Application Development Lecture 5: Protocols, Extensions,TabBar an Scroll Views Dr. Simon Völker & Philipp Wacker Media Computing Group RWTH Aachen University Winter Semester 2017/2018
2 Swift Protocols and Extensions 2
3 Protocols A protocols defines a blueprint of methods, properties and other requirements Protocols can be adopted by another type that implements these requirements Swift utilizes many protocols such as: CustomStringConvertible Equatable Comparable 3
4 CustomStringConvertible let string = "Hello, world!" print(string) // Output: Hello, world! let number = 42 print(number) // Output: 42 let boolean = false print(boolean) // Output: false 4
5 CustomStringConvertible class Shoe { let color: String let size: Int let haslaces: Bool let myshoe = Shoe(color: "Black", size: 12, haslaces: true) let yourshoe = Shoe(color: "Red", size: 8, haslaces: false) init(color: String, size: Int, haslaces: Bool) { self.color = color self.size = size self.haslaces = haslaces print(myshoe) // Output: Shoe print(yourshoe) // Output: Shoe 5
6 CustomStringConvertible class Shoe : CustomStringConvertible { let color: String let size: Int let haslaces: Bool init(color: String, size: Int, haslaces: Bool) { self.color = color self.size = size self.haslaces = haslaces var description: String { return "Shoe(color: \(color), size: \(size), haslaces: \(haslaces))" let myshoe = Shoe(color: "Black", size: 12, haslaces: true) let yourshoe = Shoe(color: "Red", size: 8, haslaces: false) print(myshoe) // Output: Shoe(color: Black, size: 12, haslaces: true) print(yourshoe) // Output: Shoe(color: Red, size: 8, haslaces: false) 6
7 Equatable struct Employee { var firstname: String var lastname: String var jobtitle: String var phonenumber: String let employeea = Employee(...) let employeeb = Employee(...) if employeeb == employeea { // Do Something else { // Do Something else 7
8 Equatable struct Employee : Equatable { var firstname: String var lastname: String var jobtitle: String var phonenumber: String static func ==(lhs: Employee, rhs: Employee) -> Bool { return lhs.firstname == rhs.firstname && lhs.lastname == rhs.lastname && lhs.companyid == rhs.companyid let employeea = Employee(...) let employeeb = Employee(...) if employeeb == employeea { // Do Something else { // Do Something else 8
9 Comparable struct Employee { var firstname: String var lastname: String var jobtitle: String var phonenumber: String let employees = [employee1, employee2, employee3, employee4, employee5] let sortedemployees = employees.sorted(by: <) static func ==(lhs: Employee, rhs: Employee) -> Bool { return lhs.firstname == rhs.firstname && lhs.lastname == rhs.lastname && lhs.companyid == rhs.companyid 9
10 Comparable struct Employee : Comparable { var firstname: String var lastname: String var jobtitle: String var phonenumber: String let employees = [employee1, employee2, employee3, employee4, employee5] let sortedemployees = employees.sorted(by: <) static func ==(lhs: Employee, rhs: Employee) -> Bool { return lhs.firstname == rhs.firstname && lhs.lastname == rhs.lastname && lhs.companyid == rhs.companyid static func < (lhs: Employee, rhs: Employee) -> Bool { return lhs.lastname < rhs.lastname 10
11 Creating a Protocol protocol FullyNamed { var fullname: String { get func sayfullname() 11
12 Creating a Protocol protocol FullyNamed { var fullname: String { get func sayfullname() struct Person: FullyNamed { var firstname: String var lastname: String var fullname: String { return "\(firstname) \(lastname)" func sayfullname() { print(fullname) 12
13 Delegation Design pattern that delegates functionality an instance of a class or structure Mostly implemented using Protocols Commonly used in UIKit UITableViewDelegate UIPickerViewDelegate From SpriteKit: SKPhysicsContactDelegate In contrast to normal protocols they often provide optional protocol requirements 13
14 Optional Protocol protocol CounterDataSource optional func increment(forcount count: Int) -> optional var fixedincrement: Int { get Functions or parameters with optional modifier don t have to be implemented Works only with with Protocols can only be adapted by Objective-C classes 14
15 Optional Protocol protocol CounterDataSource optional func increment(forcount count: Int) -> optional var fixedincrement: Int { get Functions or parameters with optional modifier don t have to be implemented Works only with with Protocols can only be adapted by Objective-C classes 15
16 Optional Protocol Requirements The SKPhysicsContactDelegate from SpriteKit public protocol SKPhysicsContactDelegate : NSObjectProtocol { optional public func didbegin(_ contact: SKPhysicsContact) optional public func didend(_ contact: SKPhysicsContact) 16
17 Extensions Extensions add functionality to types that are already defined. You can add: extension SomeType { // new functionality to add to // SomeType goes here computed properties, define methods, provide new initializers, or conform an existing type to a protocol You cannot add properties! extension UIColor { static var favoritecolor: UIColor { return UIColor(red: 0.5, green: 0.1, blue: 0.5, alpha: 1.0) 17
18 Extensions struct Employee { var firstname: String var lastname: String var jobtitle: String var phonenumber: String struct Employee { var firstname: String var lastname: String var jobtitle: String var phonenumber: String static func ==(lhs: Employee, rhs: Employee) -> Bool { return lhs.firstname == rhs.firstname && lhs.lastname == rhs.lastname && lhs.companyid == rhs.companyid extension Employee : Equatable { static func ==(lhs: Employee, rhs: Employee) -> Bool { return lhs.firstname == rhs.firstname && lhs.lastname == rhs.lastname && lhs.companyid == rhs.companyid 18
19 UIView Controllers 19
20 Tab Bar Controller 20
21 View Controller Life Cycle Not Loaded View Controllers can be in one of these stats: viewdidload() View not loaded View appearing viewwillappear(_:) View appeared View disappearing View disappeared Disappeared viewdiddisappear(_:) Appear viewdidappear(_:) viewwilldisappear(_:) 21
22 Application Life Cycle 22
23 AppDelegate.swift func application(_ application: UIApplication, didfinishlaunchingwithoptions launchoptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool { return true func applicationwillresignactive(_ application: UIApplication) { func applicationdidenterbackground(_ application: UIApplication) { func applicationwillenterforeground(_ application: UIApplication) { func applicationdidbecomeactive(_ application: UIApplication) { func applicationwillterminate(_ application: UIApplication) { 23
24 Scroll Views 24
25 ScrollView UIScrollView Parent of UITableView Allows to show content that does not fit on one screen.frame property Where on the screen is the ScrollView?.contentSize property How large is the scrollable area? 25
26 Setting the contentsize let aview = UIView.init(frame: CGRect.init( x: 0, y: 0, width: 2000, height: 2000)) self.thescrollview.addsubview(aview) self.thescrollview.contentsize = aview.frame.size 26
27 ScrollView with StackView Size of a StackView is defined by its content 27
28 Content Insets Use insets to provide padding to your content e.g., on the bottom when displaying the keyboard 28
29 Content Insets let contentinsets = UIEdgeInsetsMake(0.0, 0.0, 300, 0.0) self.thescrollview.contentinset = contentinsets self.thescrollview.scrollindicatorinsets = contentinsets 29
30 UIScrollViewDelegate func scrollviewdidscroll(_ scrollview: UIScrollView) { func viewforzooming(in scrollview: UIScrollView) -> UIView? { func scrollviewdidendscrollinganimation(_ scrollview: UIScrollView) { func scrollviewwillbegindragging(_ scrollview: UIScrollView) { func scrollviewwillbegindecelerating(_ scrollview: UIScrollView) {... 30
31 MVC in ios User action Controller Controller ViewController ModelController Update View Model Storyboard Update Notify Model Classes Persistent Storage 31
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